most of the 2.X->3.0 commit (up to rev 4299) except for gtk2_ardour/editor_canvas...

[ardour.git] / libs / ardour / ardour / audio_buffer.h

diff --git a/libs/ardour/ardour/audio_buffer.h b/libs/ardour/ardour/audio_buffer.h
index 71eaf60ade8cf7073cc0235af981cf4be54221bd..9a41e8e093f82ceb6de9dab2cd9aab6e05727421 100644 (file)
--- a/libs/ardour/ardour/audio_buffer.h
+++ b/libs/ardour/ardour/audio_buffer.h
@@ -78,6 +78,19 @@ public:
 
                _silent = ( (src.silent() && _silent) || (_silent && gain_coeff == 0) );
        }
+
+       /** Accumulate (add) @a len frames FROM THE START OF @a src into self at @a offset
+        * scaling by @a gain_coeff */
+       void accumulate_with_gain_from(const Sample* src_raw, nframes_t len, nframes_t offset, gain_t gain_coeff) {
+               assert(_capacity > 0);
+               assert(offset + len <= _capacity);
+
+               Sample*       const dst_raw = _data + offset;
+
+               mix_buffers_with_gain (dst_raw, src_raw, len, gain_coeff);
+
+               _silent = (_silent && gain_coeff == 0);
+       }
        
        void apply_gain(gain_t gain, nframes_t len, nframes_t offset=0) {
                apply_gain_to_buffer (_data + offset, len, gain);